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{{Status|Canon}}
{{Era|UNSC|HCW}}
{{Wikipedia}}
{{SeeWikipedia}}
[[File:HReach-OnagerMDC.png|thumb|300px|An [[Mark 2488 Magnetic Accelerator Cannon|Onager]] mass driver.]]
[[File:HReach-OnagerMDC.png|thumb|300px|An [[15cm Mark/2488 1.1GJ MAC|Onager]] mass driver in ''[[Halo: Reach]]''.]]
The '''mass driver''' is a [[United Nations Space Command]] weapons system and orbital launch assembly.<ref name="contact">'''Halo: Contact Harvest''', ''pages 117-118''</ref><ref name="reach">'''Halo: Reach''', campaign level ''[[The Pillar of Autumn (Halo: Reach level)|The Pillar of Autumn]]''</ref> The operating principle of the mass driver is essentially the same as that of the [[Magnetic Accelerator Cannon]]: a [[Wikipedia:Coilgun|coilgun]] that magnetically accelerates a package consisting of a magnetizable holder containing a payload.
The '''mass driver''' is a [[United Nations Space Command]] weapons system and orbital launch assembly.<ref name="contact">'''[[Halo: Contact Harvest]]''', ''pages 117-118''</ref><ref name="reach">'''[[Halo: Reach]]''', campaign level ''[[The Pillar of Autumn (Halo: Reach level)|The Pillar of Autumn]]''</ref> The operating principle of the mass driver is essentially the same as that of the [[Magnetic Accelerator Cannon]]: a [[Wikipedia:Coilgun|coilgun]] that magnetically accelerates a package consisting of a magnetizable holder containing a payload.


==Description==
==Description==
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Mass drivers consist of flexible "gimbal" assemblies that are linked with magnetic induction devices. They can be loaded with payloads of limited weight, and by means of magnetic induction, mass drivers can propel low-weight payloads into orbit, i.e. easy disposal of hazardous nuclear waste. Mass drivers were used in developing colonies such as [[Harvest]] for orbital lifting, but their capacity for loads of limited mass eventually forced colony worlds to resort to more robust mechanisms for lifting.
Mass drivers consist of flexible "gimbal" assemblies that are linked with magnetic induction devices. They can be loaded with payloads of limited weight, and by means of magnetic induction, mass drivers can propel low-weight payloads into orbit, i.e. easy disposal of hazardous nuclear waste. Mass drivers were used in developing colonies such as [[Harvest]] for orbital lifting, but their capacity for loads of limited mass eventually forced colony worlds to resort to more robust mechanisms for lifting.


The magnetic induction technology of the mass driver was later applied to a whole field of magnetically operated UNSC projectile weaponry, such as the Magnetic Accelerator Cannon and the [[M68 Asynchronous Linear-Induction Motor]].
The magnetic induction technology of the mass driver was later applied to a whole field of magnetically-operated UNSC projectile weaponry, such as the [[M99 Stanchion]] and the [[Magnetic Accelerator Cannon]].


==Usage==
==Usage==
[[File:H4-MP-Longbow-MAC-02.jpg|thumb|230px|left|A ground-based mass driver station on Concord. Note the device's closer resemblance to a [[Railgun (fiction)|railgun]] than to a coilgun.]]
The mass driver on Harvest was originally used for firing nuclear waste into [[Epsilon Indi]], Harvest's sun, and also used during solstice celebrations on Harvest.<ref name="contact"/> Additionally, they could be used as impromptu weaponry, as demonstrated in the [[First Battle of Harvest]]; their magnetic induction technology could be used to propel projectiles at extremely high speeds with a high degree of accuracy, even going so far as to disable the Covenant ship, ''[[Rapid Conversion]]'', in two well-placed shots. Later in the battle, the UNSC [[Planetary Security Intelligence]] [[Loki]] used a mass driver to destroy Harvest's orbital facility, the ''Tiara''.
The mass driver on Harvest was originally used for firing nuclear waste into [[Epsilon Indi system|Epsilon Indi]], Harvest's sun, and also used during solstice celebrations on Harvest.{{Ref/Reuse|contact}} Additionally, it could be used as an impromptu weapon, as demonstrated in the [[First Battle of Harvest]]; its magnetic induction technology could be used to propel projectiles at extremely high speeds with a high degree of accuracy, even going so far as to disable the Covenant ship ''[[Rapid Conversion]]'' in two well-placed shots. Later in the battle, the UNSC [[Planetary Security Intelligence]] [[Loki]] used a mass driver to destroy Harvest's orbital facility, the ''[[Tiara]]''.


Sometime after the colonization of Harvest, the shipping operations [[Artificial intelligence|AI]] [[Sif]] had a critical failure in her data center's power supply. Trying to be as helpful as possible, another AI, [[Mack]], used the mass driver to boost the component into orbit - literally shooting the power supply into the ''Tiara''<nowiki>'</nowiki>s coupling station.{{Ref/Reuse|contact}} This was a very risky move, seeing as Mack could have easily destroyed Sif's main data center, effectively "killing" her.
Sometime after the colonization of Harvest, the shipping operations [[Artificial intelligence|AI]] [[Sif]] had a critical failure in her data center's power supply. Trying to be as helpful as possible, another AI, [[Mack]], used the mass driver to boost the component into orbit - literally shooting the power supply into the ''[[Tiara]]''<nowiki>'</nowiki>s coupling station.<ref name="contact"/> This was a very risky move, seeing as Mack could have easily destroyed Sif's main data center, effectively "killing" her.


[[Longbow Station]] in the northern polar region of [[Concord]] had a number of channel-based mass drivers, used by the [[Unified Earth Government]] to deliver deep-space monitoring relays to study remote star systems before the [[Human-Covenant War]]. At least one of Concord's mass drivers appeared to be based on [[Railgun (fiction)|railgun]] technology, as opposed to the coilgun technology used by other known mass drivers.<ref>'''Halo 4''', multiplayer map ''[[Longbow]]'' description</ref>
The [[Rubble]] possessed two Mass Drivers which were used to break up larger asteroids to make mining them easier.<ref name="CP">'''[[Halo: The Cole Protocol]]''', ''page ??''</ref> They were later used to disable the {{UNSCShip|Midsummer Night}}, but were later destroyed by the Covenant ship ''[[Infinite Spoils]]''.


[[The Rubble]] possessed two mass drivers which were used to break up larger [[asteroid]]s to make mining them easier. They were later used to disable the {{UNSCShip|Midsummer Night}}, but were later destroyed by the Covenant ship ''[[Infinite Spoils]]''.<ref name="CP">'''Halo: The Cole Protocol''', ''page ??''</ref>
During the [[Battle of Reach]], [[Emile-A239]] manned an [[15cm Mark/2488 1.1GJ MAC|Onager]] mass driver to fend off Covenant forces assaulting the {{UNSCShip|Pillar of Autumn}}.<ref name="reach"/> However, the SPARTAN-III was killed by two Sangheili warriors, prompting [[SPARTAN-B312]] to commandeer the cannon and destroy an incoming [[CCS-class Battlecruiser]] in order to allow the ''Autumn'' to escape.<ref name="reach"/>


During the [[Siege of New Alexandria]] in the [[Fall of Reach]], [[New Alexandria|the city's]] mass driver was used to unsuccessfully stop an approaching {{Pattern|Ceudar|heavy corvette}} within "danger close" range.<ref>'''Halo: Reach''', campaign level ''[[Exodus]]''</ref> On the last day of the invasion, [[Emile-A239]] manned a [[Mark 2488 Magnetic Accelerator Cannon|Mark 2488 Onager]] mass driver to fend off Covenant forces assaulting the {{UNSCShip|Pillar of Autumn}} at the [[Asźod ship breaking yards]].{{Ref/Reuse|reach}} However, Emile was killed by two [[Sangheili]] warriors, prompting [[SPARTAN-B312]] to commandeer the cannon and destroy an incoming {{Pattern|Ket|battlecruiser}} in order to allow the ''Autumn'' to escape.{{Ref/Reuse|reach}}
During the [[Raid on Ivanoff Station]] in the summer of [[2557]], several mass drivers were used to defend the [[Composer]] from invading [[Jul 'Mdama's Covenant faction|Covenant remnant]] forces under the auspices of the [[Ur-Didact|Didact]] and his ship, the ''[[Mantle's Approach]]''. Ultimately, they failed to prevent him from acquiring the Composer.<ref>'''Halo 4''', campaign level ''[[Composer (level)|Composer]]''</ref>
{{Clear}}
==Gallery==
==Gallery==
<gallery>
<gallery widths="160">
File:Onager.jpg|The Onager installed in the Asźod ship breaking yards.
File:Onager.jpg|The Onager installed in the Aszod ship breaking yards.
File:Onager charging.jpg|A mass driver's magnetic coils charging.
File:Onager charging.jpg|A mass driver's magnetic coils charging.
File:HaloReach - MACrusher.jpg|SPARTAN-B312 firing a mass driver at an incoming ''Ket''-pattern battlecruiser.
File:HaloReach - MACrusher.jpg|A mass driver, manned by [[SPARTAN-B312]], firing a round at the incoming Covenant CCS-class Battlecruiser.
</gallery>
</gallery>


==List of appearances==
==List of appearances==
*''[[Halo: Reach]]''
*''[[Halo: Contact Harvest]]'' {{1st}}
*''[[Halo: Contact Harvest]]'' {{1st}}
*''[[Halo: The Cole Protocol]]''
*''[[Halo: The Cole Protocol]]''
*''[[Halo: Reach]]''
*''[[Halo 4]]''
*''[[Halo: Silent Storm]]''
*''[[Halo: Winter Contention]]'' {{Mo}}


==Sources==
==Sources==
{{Ref/Sources}}
<references/>
 
{{UNSC heavy weapons}}
 
[[Category:Magnetic acceleration weapons]]
[[Category:Magnetic acceleration weapons]]

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